Nice set of heavy weapons
... While I'm not sure how effective they are on the table, they certainly were fun to paint up.
And when has effectiveness ever entered a skaven players plan? For me most of the fun has been watching my own weaponry do nothing, massive damage or just blow up - actually it's normally the first or last thinking on...
For me, Songs of Blades suffice rather than big numbers of troops but out of the rule sets I've got Kngs of War or Rebel Miniatures Mighty Armies sit well. The latter give fewer troop choices but smooth playing where as KoW harks back to early GW.